You don't need to use regexes for this. In pseudocode:

use List::MoreUtils qw{uniq}
while (<FH>){
chomp;
convert each line to an array of numbers splitting by "-"
sort the resulting list of numbers
and apply uniq to this list:  my @list_of_unique_items = uniq @list;
join or print again each element followed by a "-"
chomp again if needed to delete the last "-"
undef the array
process the next line

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In reply to Re: How can I reduce this with a REGEX? by pvaldes
in thread How can I reduce this with a REGEX? by misterperl

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